Top 10 JSLint Best Practices


JavaScript is an extremely forgiving language. You can get away with writing sloppy code and it will still work in modern browsers. This can lead to a lot of bad practices, however. A good way to make sure you’re writing good JavaScript code is to use JSLint. Here are some of the top best practices we’ve learned from using JSLint on our code:

Many of the best practices for writing JavaScript are subjective. For example, you may prefer to use double-quotes, or you may prefer single-quotes. In this case, style guides like Google’s cannot be considered “best practices”. They simply reflect the preferences of certain developers. This is fine and appropriate.

However, there are a handful of best practices that are not subjective. These are generally related to performance and maintenance. The goal of JSLint is to eliminate bugs and promote good practices by enforcing a small set of rules that can be objectively applied.

JSLint isn’t perfect—no tool can be—but it’s not bad, either. If you’ve never used JSLint before, I suggest trying it out on some of your existing code bases before writing it off as “not for you” or “too strict.” It will likely find some bugs in your code, and it may help you improve your coding style as well.

Here are my top 10 JSLint best practices (in no particular order):

1) Use trailing commas in array and object literals

Trailing commas in array and object literals are allowed by ECMAScript 5th Edition (ES5) and above. This means that you

I have picked up 10 best practices from my experience of using JSLint over the past few years. These best practices are not specific to any particular project or framework, and you can apply them in your day-to-day work. JSLint is a linting tool for JavaScript that helps developers to check their code for potential errors and enforces code style.

I recommend using JSLint as an npm task during development. This will allow you to run the tool every time you make changes to your source code and catch mistakes before they go into production.

You can install JSLint as a global npm module or use it locally in your project directory:

npm install jslint -g

Then create a file called jslint.js with the following content:

var fs = require(‘fs’);

var path = require(‘path’);

var jslint = require(‘jslint’).load(‘full’);

var filePath = process.argv[2];

fs.readFile(filePath, ‘utf8’, function (err, data) {

if (err) { throw err; } else {

var result = jslint(data);

if (!result.ok

JSLint is a tool used in software development for checking if JavaScript source code complies with coding rules. It was developed by Douglas Crockford and is available online. JSLint takes a JavaScript source and scans it. If it finds a problem, it returns a message describing the problem and an approximate location within the source. The problem is not necessarily a syntax error, although it often is. JSLint looks at some style conventions as well as structural problems. It can also produce warnings about suspicious usage. In order to be useful, JSLint must enforce coding conventions more strictly than most developers would like.

Here are 10 best practices I found when using JSLint:

JavaScript is a language that evolves quickly, and it’s only natural that new practices arise as developers gain experience with the language. With this in mind, here are my top ten best practices for writing JavaScript.

1. Use JavaScript Strict Mode

2. Always return a value from functions

3. Use === instead of ==

4. Write small functions (7-15 lines)

5. Keep the number of function parameters to three or fewer

6. Don’t use leading underscores on variables and parameters

7. Keep variable names short but descriptive (1-3 characters)

8. Declare variables at the top of their scope

9. Initialize all your variables up front

10. Use semicolons

JSLint, the JavaScript Verifier

JSLint is a tool that helps to detect errors and potential problems in your JavaScript code. The process of fixing mistakes takes time. JSLint looks for more than 150 problems. It will help you to eliminate most of them quickly, saving lots of time in debugging.

The list below is a set of ways to use JSLint effectively in your coding. It’s not a set of rules you must follow; it’s a set of recommendations that will help you get the most out of JSLint.

1. Set up an editor plugin: there are plugins available for most editors, including Sublime Text 2 (using JSLint), Vim (using Syntastic), Eclipse (using JSEclipse), IntelliJ IDEA (using IdeaJad) or Emacs (using Flymake). You can also use NodeJS to install the CLI version with NPM. This allows you to see warnings and errors as soon as you save your file, instead of having to manually open the page in your browser and wait until the page is loaded before the error messages appear in the console log.

2. Don’t try to change JSLint’s defaults: JSLint was designed by Douglas Crockford and

1. Declare Variables with var


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